Abstract: Process for the work-up of naphtha, wherein a) naphtha or a stream produced from naphtha in a pretreatment step is separated in a membrane unit into a stream A which is depleted in aromatics and a stream B which is enriched in aromatics, with the aromatics concentration in stream A being from 2 to 12% by weight (step a), b) at least part of the substream A is fed to a steam cracker (step b), c) at least part of the substream B is fed to a unit in which it is separated by means of a thermal process into a stream C which has a lower aromatics content than stream B or a plurality of streams C?, C?, C?? . . . which each have lower aromatics contents than stream B and a stream D which has a higher aromatics content than stream B or a plurality of streams D?, D?, D?? . . .

Abstract: A process for the isolation of salts of organic acids from an aqeuous solution, in particular from a fermentation discharge, by partial evaporative crystallization and subsequent or simultaneous displacement precipitation of its salts, and for the liberation of the organic acid from the crystals, preferably by means of an electromembrane process, is described.